In 1939, National Socialists dedicated the street to Dr Carl Peters, a leader of Germany's violent colonial efforts in Africa.

"They said, 'Hey, this guy was one of the founders of our empire and we have to honour him,'" said Aikins, 38, a German social scientist and activist with Ghanaian roots. "This is actually Nazi propaganda."

Germany has long been lauded for the way it has confronted its Nazi history, from issuing formal apologies to paying reparations to victims. But the country's reckoning with its Nazi past is not as complete as might be assumed, activists and historians say.

A crowd gathers at a street festival organised to raise awareness of the cultural heritage of the street name Mohrenstrasse, in Berlin.

Photo: New York Times

Germany has yet to come to terms with its violent colonial legacy in Africa, which laid the groundwork for and inspired Nazi atrocities, they say.

Running from 1884 to 1918, that colonial history was relatively short, compared with that of other European countries, but still scarring. German colonisers killed tens of thousands during their reign over all or part of modern-day Ghana, Togo, Cameroon, Rwanda, Burundi, Tanzania and Namibia.

Street signs and other memorials honouring German colonisers still remain scattered throughout the country. Only a smattering of colonial history is taught in German schools. The government has not apologised for the nation's colonial crimes, and it only recently started referring to the killings as genocide.

Germany's reticence "speaks a lot about the stance that German society, or European society, takes vis-a-vis the colonial history," said Nadja Ofuatey-Alazard, a cultural activist who is from Germany and whose father is Ghanaian. "They still adhere to the myth of the civilising mission. They do not frame colonialism as a regime of violence and domination."

Those attitudes appear to be slowly changing.

Pedestrians at the entrance of the subway station at Mohrenstrasse, or Mohren Street, Berlin. Activists are calling to rename the street, as Mohren is generally considered a racist insult referring to dark-skinned people.

Photo: New York Times

Berlin officials agreed a couple of months ago to rename Petersallee and two other streets honouring German colonisers, much to the delight of activists who have spent years lobbying for the changes. The streets will be named after African resistance fighters.

Aikins, a long-time proponent of renaming, said the name changes were a start.

"We need a citywide concept of commemoration that actually enacts this shift of perspective," he said. "Moving away from remembering through the colonial lens to remembering through the perspective of remembering anti-colonial resistance."

This year, Germany's federal governing coalition for the first time called for an examination of the country's colonial history, which includes researching whether African artefacts housed at cultural institutions were illegally acquired during the colonial era.

The German government is in its third year of negotiations with Namibia over how to make up for crimes against the former colony, where tens of thousands died under German occupation. Ruprecht Polenz, a former member of Parliament who is representing Germany in the negotiations, said the two sides were closing in on an agreement that could lay the groundwork for an official apology.

The agreement would call the German killings a genocide; outline the creation of a foundation to increase social and cultural engagement between the countries; and call for extra support for Namibian communities particularly affected by the genocide with programs that, for example, provide job training, housing and access to electricity.

"Germany learnt from the first half of the 20th century, and we could only learn because we confronted the past and dealt with it," Polenz said. "And the colonial history also belongs to this past, and we want to take responsibility for it."

Protesters light fireworks during a far-right demonstration in Chemnitz, Germany, in August.

"The French, the English and the Germans were all together in their racist thinking," said Christian Kopp, a historian with Berlin Postcolonial, an activist organisation. "In that sense, the history of National Socialism needs a global explanation."

Colonial-era Germans set a brutal example for the Nazis to follow.

At the beginning of the 20th century, a German general, Lothar von Trotha, issued an extermination order for the Herero, a native people of what is now Namibia, using a tactic that resurfaced decades later: concentration camps.

Within 3½ years, four-fifths of the Herero people, and half of the Nama, another ethnic group, were dead, according to David Olusoga, a historian and co-author of The Kaiser's Holocaust.

Lothar von Trotha, German military commander widely condemned for his brutality in Africa.

Photo: Wikimedia/Commons

In addition to the tens of thousands of deaths in Namibia, at least 100,000 East African resistance fighters known as the Maji-Maji died in a war to defend their territory against German forces.

German colonisers took skulls and human remains from Africa back to Germany for research, using a junk science that claimed to be able to judge personality, intelligence and other characteristics by the shape of one's skull. That also became part of the racist Nazi ideology.

The Nazi vision of global expansion and domination was inspired in part by the efforts of German colonisers, historians said. A flyer from 1935 advertises a "grand colonial exhibit." There is a picture of a Nazi flag waving over Africa with the message, "This is also our living space."

In 1939, the National Socialists named a part of Berlin's African Quarter "The Permanent Colony of Togo."

Arguments over eradicating old relics fall on questions of history and racial meaning.

Black-led activist groups have been lobbying for years for the renaming of Mohrenstrasse, or Mohren Street, in Berlin. Mohren, generally considered a racist insult, is an old German word that refers to dark-skinned people.

Those for and against the renaming dispute how the street got its name — either to honour visiting Africans or to belittle those brought as servants to territory that is now Germany.

But those who want to keep the name argue that removing it would be akin to erasing history. The name, they say, could be used as a tool to teach about the nation's colonial past.

When the street got its name, in either the late-17th or early-18th century, Brandenburg-Prussia, which was in present day Germany, was profiting from the trans-Atlantic slave trade.

a delegation of Ovaherero and Nama from Namibia, Esther Utjiua Muinjangue, left, chairwoman of the Ovaherero Genocide Foundation, Ida Hoffmann, second from left, member of parliament and chairwoman of the Nama Genocide Technical Committee in Namibia in Berlin in August.

Photo: DPA/AP

But, activists argue, preserving and teaching history can be accomplished without keeping a racist insult in a public space.

"People of African descent, African people, were and to an extent are still being considered as less human," Ofuatey-Alazard said.

The German government recently returned remains stolen during the colonial era to a Namibian delegation. It was the third time Germany has made such a gesture, but it has not been without controversy.

The skulls of two people killed in the the Herero and Nama uprising between 1904 and 1908 are flanked by candles during a ceremony in Berlin in August.

Photo: DPA/AP

There remains skepticism that the country will come to terms with its colonial past. Negotiations with Namibia have dragged on for longer than the German government had predicted. Critics have faulted the government for not dealing directly with the Nama and Herero, minority ethnic groups that have been at odds with their country's leaders over the colonial question.

"We urgently need a big, courageous, political signal and we need a solution to the question of the Herero genocide," said Jurgen Zimmerer, an African history professor at the University of Hamburg. "We need a central place for remembrance and research of colonial history."